“Taylor was so dedicated to making this video,” Kahn wrote on Twitter. “I was wrapped in snow gear. She was in a dress. She suffered for her art.” He continued, “Taylor chose to stay in the mud for hours to keep the shoot moving. No in and out. Just gangstered it. She is bad ass.”

Taylor was so dedicated to making this video. I was wrapped in snow gear. She was in a dress. She suffered for her art. #OOTWMusicVideo

Kahn went into further detail in a series of Instagram posts. The director, who also helmed Swift’s videos for “Blank Space,”“Wildest Dreams,” and “Bad Blood,” shared snapshots of him scouting locations and “landing on top of mountains no human been on before.” He wrote, “Three helicopters for [“Out of the Woods” music video]. One for people, one for ground equipment, one for camera.”